This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 22 |
| 3 | 145 |
| 4 | 1086 |
| 5 | 8686 |
| 6 | 72382 |
| 7 | 620421 |
| 8 | 5428681 |
| 9 | 48254942 |
| 10 | 434294482 |
| 11 | 3948131654 |
| 12 | 36191206825 |
| 13 | 334072678387 |
| 14 | 3102103442166 |
| 15 | 28952965460217 |
| 16 | 271434051189532 |
| 17 | 2554673422960305 |
| 18 | 24127471216847324 |
| 19 | 228576043106974646 |